The 2017 Ghost shares BMW's N74 6.6L twin-turbo V12 and ZF 8-speed transmission. While luxurious, this platform is notorious for catastrophic engine failures due to carbon buildup and valve guide issues, plus cooling system and electrical gremlins that rack up five-figure repair bills.
N74 V12 Catastrophic Carbon Buildup and Valve Guide Failure
Common · high severityTypical onset: 40,000-80,000 mi
Symptoms: Misfires on multiple cylinders, often Banks 1 and 2 together, Rough idle, loss of power, excessive oil consumption (1qt per 500-1000 mi), Check engine light with valve timing codes (P0016, P0017), Metallic rattling from engine bay, especially cold starts
Fix: Direct-injection engines with no port injection suffer severe intake valve carbon buildup. Combined with weak valve stem seals, oil enters combustion chambers. This leads to piston ring damage, scored cylinder walls, and complete engine failure. Walnut blasting buys time (8-12 hours labor) but most engines at this mileage need full rebuilds: pistons, rings, bearings, valve guides, head work. Some shops replace shortblocks outright. Expect 60-100 hours labor for a proper rebuild.
Estimated cost: $35,000-65,000
ZF 8HP Transmission Mechatronic Sleeve and Solenoid Failures
Occasional · high severityTypical onset: 50,000-90,000 mi
Symptoms: Harsh or delayed shifts, especially 2-3 and 3-4, Transmission slipping into limp mode, won't shift above 3rd gear, Fault codes for shift solenoids (P0750-P0770 range), Transmission overheat warnings on dash
Fix: The mechatronic sleeve (adaptive pressure regulator) wears, causing erratic pressure and solenoid damage. Trans must be dropped (8-10 hours), mechatronic unit removed and rebuilt or replaced. Many shops replace all shift solenoids as a set during this job. Transmission oil cooler often replaced simultaneously as contamination is common.
Estimated cost: $6,500-12,000
Air Suspension Compressor and Strut Failures
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Vehicle sagging at one or both ends, especially after sitting overnight, Suspension warning light, 'Ride Height Malfunction' message, Compressor running constantly or excessively loud, Rough ride quality, bottoming out over bumps
Fix: Air struts develop leaks at bellows or internal seals. Compressor works overtime and burns out. Each strut replacement is 3-4 hours, compressor is 4-5 hours. Most owners face multiple strut replacements over vehicle life. Compressor rebuild kits exist but new OEM units are recommended.
Estimated cost: $2,800-4,500 per strut; $3,500-5,500 compressor
Turbocharger Wastegate Rattle and Failure
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Rattling noise from engine bay at idle or light throttle, Loss of boost pressure, sluggish acceleration, P0234 or P0299 codes (overboost/underboost), Blue smoke on hard acceleration
Fix: Wastegate actuator arms wear and rattle, or seize entirely. Turbos share housings with exhaust manifolds, so replacement means pulling turbos (each side 10-14 hours due to V12 packaging). Most shops replace both turbos as preventive measure given labor overlap.
Estimated cost: $8,000-14,000 for both
Coolant Transfer Pipe and Thermostat Housing Leaks
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Coolant smell in cabin or visible puddles under car, Low coolant warning light, Overheating, especially in traffic or hot weather, Coolant residue on engine valley cover or firewall
Fix: Plastic coolant pipes in the valley between cylinder banks crack from heat cycling. Thermostat housings also crack. Requires upper intake manifold removal to access (12-16 hours). Smart techs replace all valley pipes, thermostats, and expansion tank simultaneously.
Estimated cost: $4,500-7,500
Electrical Gremlins: Gateway Module and CAS Failures
Occasional · medium severitySymptoms: Random no-start conditions despite new battery, Intermittent loss of infotainment, navigation, cameras, Door locks cycling on their own, alarm false triggers, Multiple control modules showing communication faults
Fix: Central gateway module (CGW) and Car Access System (CAS) develop solder joint failures or corrupted software. Diagnosis is time-consuming (3-6 hours) as faults are intermittent. Modules require coding to VIN after replacement. Some failures tied to battery voltage sag from aging AGM batteries.
Estimated cost: $2,200-4,800
Only for the brave with deep pockets or transferable warranty—engine and transmission time bombs make this a $50k car with $200k repair potential.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.